On top of that, no vector operations or ring buffers are currently implemented, so I wouldn't be surprised if this library has significantly better performance. I do have a bit of a wish list of features to add to my code after taking a look at some of the techniques used here. It's complicated work, but I've never had a better experience learning a complicated system.

My implementation basically added a playback and mixing interface to the audio engine from this sample mixer project: http://developer.apple.com/library/ios/#samplecode/MixerHost...